Fix typos in JavaDoc for InputConnection

This CL fixes typos in JavaDoc for InputConnection.

This CL slso updates the content regarding a new API that was added in
API 25 [1][2].

 [1]: Iaadf934a997ffcd6000a516cc3c1873db56e60ad
      152944f4
 [2]: Ica1ba3154795c1bf44e140dfe639b299f83cd8af
      adebb525

Bug: 31249896
Change-Id: Icafedb15943a84f8e5b03ef9eb3a50627d508bdd